JPS63100270A - Decompressor device for 2-cycle engine - Google Patents

Abstract

PURPOSE:To facilitate a starting work, by a method wherein, with a control lever rotated in a forward direction around a rotary member during starting, a decompressor body is actuated, and with an engine run, the projection of the rotary member causes backward movement of the control lever to release a decompressor body. CONSTITUTION:A control lever 61 is rotated in a forward direction around a recoil starter 41, and a projection 71 is set to a position slightly displaced toward the starting rotation side from a projected part 61b. In this case, a piston 17 is brought into a state in that the piston is positioned somewhat this side of a top dead center. Since a wire 57, simultaneously, is pulled in the direction of the control lever 61 by means of a locking part 61a, a decompressor body 51 is actuated. Since compressed air in a cylinder 16 is escaped through a communicating passage 52, a handle can be pulled with a low force to facilitate starting. When an engine 1 is run, the control lever 61 is rotated by means of a projection 71, the projected part 61b is moved backward, the decompressor is also released, and the engine 1 is started with injected fuel self-ignited.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a decompression device for a two-stroke engine used to drive, for example, a generator or the like.

[Conventional technology]

Engines that are manually started or equipped with a coil starter are equipped with a decompression device that releases the pressure in the combustion chamber immediately before compression to the outside to reduce the compression pressure, in order to facilitate starting.

This type of decompression device is generally equipped with a movable valve body that opens and closes this passage in a passage that communicates between the inside of the cylinder and the outside, and this valve body can be manually operated via a decompression lever. The barrel is configured to open the passage.

[Problem that the invention seeks to solve]

However, with this structure, the operator has to operate the decompression lever at the right time while pulling the recoil starter rope, which not only requires some getting used to but also makes the starting work complicated. That is, this is because two actions, pulling the lobe and operating the lever, must be performed at the same time.

[Means for solving problems]

The present invention was made in view of these circumstances, and provides a decompression device for a two-stroke engine that facilitates starting. The decompression device according to the present invention is provided with an operation lever connected to the decompression main body via a wire so as to be movable forward and backward with respect to a rotating member that rotates at the same rotational speed as the crankshaft. A locking means is provided for moving forward and locking the decompression main body in an operating state, and a projection is provided on the rotary member for engaging with the operating lever and retracting the operating lever.

[Effect]

In the present invention, when the operating lever is moved forward relative to the rotating member at the time of starting, the decompression main body is activated, so that the engine is rotated with a small force. Furthermore, when the engine rotates, the operating lever is moved backward by the protrusion of the rotating member, so that the decompression is released and the inside of the cylinder is put into a compressed state, so that the fuel is combusted and the engine is started.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded cross-sectional view showing a two-stroke diesel engine equipped with a two-stroke engine decompression device according to the present invention. As shown in FIG. 2, this engine 1 is used, for example, as a driving source for a generator 2, and is fixed on a base 3 at a predetermined distance from the generator 2. 4 is a crankcase that supports the crankshaft 5 and also supports the crankshaft 5.
A crank chamber 6 is formed for accommodating crank weights and the like and for compressing intake air. Both ends of the crankshaft 5 penetrate the side wall of the crankcase 4 and protrude to the outside,
A flywheel 7 and an output pulley 8 are mounted on one end, and a drive gear 9 is mounted on the other end. A belt 11 is passed between the output pulley 8 and the input pulley 10 of the generator 2. In addition, the drive gear 9
A first driven gear 12 constituting a transmission which will be described later is shown in FIG.
are engaged.

A cylinder body 15 is fixed above the crankcase 4, and a piston 17 is slidably held in the cylinder 16. 18 is a cylinder head that closes the upper part of the cylinder 16; 19 is a connecting rod that connects the crankshaft 5 and the piston 17; and 20 and 21 are exhaust passages and scavenging passages that are opened on the circumferential surface of the cylinder 160. 22 is a case cover that covers the sides of the crankcase 4.

Reference numeral 25 denotes a transmission case that is continuously formed behind the crankcase 4, and forms a transmission chamber 26 behind the crank chamber 6. The transmission housed in this transmission chamber 26 is
This is for decelerating and outputting the rotation of the crankshaft 5 so that the engine 1 can be used to drive pumps other than the generator 2, vehicles, etc.

A cam case 31 projects from the upper surface of the transmission case 25, and has a cam chamber 32 extending in the width direction inside thereof.

33 is a cam shaft arranged in the width direction in this cam chamber 32;
The cam case 31 is supported parallel to the crankshaft 5 via bearings 34 and 34 provided on both side walls of the cam case 31. Both ends of the camshaft 33 protrude outside the cam case 31, and a gear 35 for driving the camshaft 33 is mounted on one end. This gear 35 has the same number of teeth as the drive gear 9 of the crankshaft 5 and meshes with the first driven gear 12 .

Therefore, it rotates at the same rotational speed as the crankshaft 5.

Further, a cooling fan 36 and a coil starter 41 facing the cooling fan 36 are provided on the other end side of the camshaft 33 . This recoil starter 41 includes a pulley 43 rotatably supported by a cover 42, a row 144 wound around this pulley 43, a handle 45 provided at the tip of this row 144, and a handle 45 that can be pulled. The drive piece 47 transmits the rotation of the pulley 43 rotated by the camshaft 33 to the camshaft 33 via the cylindrical coupling 46.

51 is a decompression body provided on the upper part of the cylinder body 15. This decombination main body 51 has a valve body 53 that opens and closes a communication passage 52 that communicates the cylinder 16 with the outside, and this valve body 53 is urged outward by a spring 54 so as to always close the communication passage 52. There is. A decompression lever 55 presses the valve body 53 inward to open the communication passage 52, and one end 57a of a wire 57 inserted through the tube 56 is locked therein.

Reference numeral 61 denotes an operating lever that is spaced apart from the decompression main body 51 and is provided so as to be movable forward and backward relative to the recoil starter 41 via a mounting bracket 62. In the embodiment, as shown in FIG. 3 is an enlarged side view, FIG. 4 is a sectional view taken along the line ■-IV in FIG. 3, and FIG. 5 is a sectional view taken along the line V-V in FIG. An operating lever 61 having a shape is pivotally supported by a bolt 63.

More specifically, the operating lever 61 has a cylindrical portion in the center, and a locking portion 61 that locks the other end 57b of the wire 57 from the cylindrical portion.
a, a protrusion 61b protruding in the direction of the recoil starter 41;
A setting portion 61c for rotating the 1-operation lever 61 is provided to protrude in three directions. Reference numeral 64 denotes a tube fitting that is screwed onto the fitting 62 and locks the tube 56 therein.

Reference numeral 65 denotes a ball as a locking means provided on the operating lever 61, and is used to maintain the protruding portion 61b in a state in which it moves forward with respect to the coil starter 41 as shown by the chain line in FIG. That is, the ball 65 is accommodated in the holding hole 67 of the holding member 66 fixed to the mounting bracket 62, and the ball 65
The operating lever 61 is always biased in the direction of the operating lever 61. On the other hand, the cylindrical portion of the operating lever 61 is provided with an engagement hole 69 into which the ball 65 is inserted when the operating lever 61 rotates in the direction of arrow A and the protruding portion 61b moves forward.

Note that when the ball 65 is not engaged in the engagement hole 69,
The operating lever 61 is always biased in the direction of arrow B by a tear spring 70 wound around the cylindrical portion.

Here, when the protruding part 61b moves forward, the locking part 61a separates from the tube fitting 64 and is pulled toward the tube 56, so the wire 57 operates the decompression main body 15, and when the protruding part 61b moves back, it is locked. Since the portion 61a approaches the tube fitting 64 and is loosened, the operation of the decompressor main body 15 is released.

Reference numeral 71 denotes a single protrusion protruding from the inner surface of the pulley 43. When the protrusion 61b of the operating lever 61 is in a forward moving state, the protrusion 71 engages with the protrusion 61b and rotates the operating lever 61 in the direction of arrow B.
1b, and is set at a position where the piston 17 engages with the protrusion 61b when the piston 17 is a certain distance before the top dead center.

Note that 81 is fixed to the camshaft 33 and is a fuel injection pump 82.
83 is a governor fixed inside the fuel cam that drives the fuel cam.

In the decompression device for a two-stroke engine configured as described above, first, the operating lever 61 is rotated to move the protrusion 61b to the recoil starter 41 as shown by the chain line in FIG.
move forward against At this time, the position of the protrusion 71 of the cut coil starter 41 is set to the position shown by the broken line, which is slightly shifted from the protrusion 61b toward the starting rotation direction. In this way,
Since the wire 57 is pulled toward the operating lever 61 by the locking portion 61a, the decompression main body 15 is operated. For this reason,
Since the compressed air in the cylinder 16 is released from the communication path 52, the handle 45 can be pulled with a small force, making it easy to start the engine.

Then, when the engine 1 is rotated and the protrusion 71 reaches the position shown by the chain line in FIG. 3, the operating lever 61 is rotated by the protrusion 71 and the protrusion 61b is retracted.

Therefore, the wire 57 is loosened and decompression is released.
The inside of the cylinder 16 becomes compressed. As a result, the compression temperature becomes high and the injected fuel self-ignites, so the engine 1 is started.

Therefore, when the engine 1 rotates, the decompression can be automatically released, and the user can activate the recoil starter 4.
The engine 1 can be started by simply pulling the handle 45 of the engine 1.

In the above embodiments, an example has been described in which the present invention is applied to a two-stroke diesel engine, but the present invention is not limited thereto, and can also be applied to a gasoline engine. Further, the flywheel 7 may be a rotating member.

〔Effect of the invention〕

As explained above, according to the present invention, an operating lever connected to the decompression main body via a wire is provided so as to be movable forward and backward with respect to a rotating member that rotates at a rotational speed equal to that of the crankshaft. A locking means is provided that moves forward with respect to the rotating member and locks the decompression body in the operating state, and a protrusion that engages with the operating lever and moves the operating lever backward is provided on the rotating member, so that the operating lever can be rotated. When the engine is rotated with the decombing main body moved forward relative to the member and activated, the operating lever is moved back by the protrusion on the rotating member and the inside of the cylinder is automatically compressed, making it possible to start the engine. can.

Therefore, the engine can be started by a single action of rotating the engine using a recoil starter, etc., making it easier to start the engine than in the past, where the action of rotating the engine and releasing the decombination are performed at the same time. .

[Brief explanation of the drawing]

Fig. 1 is an exploded sectional view showing a 2-stroke diesel engine equipped with a 2-stroke engine decombination device according to the present invention, and Fig. 2 is a developed sectional view showing a 2-stroke diesel engine equipped with a 2-stroke engine decombination device according to the present invention.
A side view showing the cycle diesel engine, Figure 3 is an enlarged side view showing the operating lever, and Figure 4 is IV-m of Figure 3.
5 is a sectional view taken along line V--V in FIG. 4. 5...Crankshaft, 15...Cylinder body, 3
3...Camshaft, 41...Recoil starter, 4
3...Pulley, 51...Decompression body, 57...
...Wire, 61...Operation lever, 65...
Ball, 71... protrusion

Claims (1)

[Claims] A decompression body provided on the cylinder body, an operation lever provided so as to be able to move forward and backward with respect to a rotating member that is spaced apart from the decompression body and rotates at the same rotational speed as the crankshaft, and an operation lever that connects these members and controls the rotation of the rotation member. a wire that activates the decompression main body when the decompression body moves forward relative to the member and deactivates the decompression main body when the decompression main body moves backward relative to the member; A two-cycle engine decompression device comprising a rotating member provided with a protrusion that engages with an operating lever to move the operating lever backward.